First off - great to see another Bulgarian here! Care to exchange ICQs? My nick there is the same, it'll be nice to have more CG friends!

On the topic - I can't seem to be able to do it with the standard operators (incl speed by icon), and I've found out that this is somewhat of a common pain to pflow users. Oleg Bayborodin passed a poll on the orbaz.com forums on which the next freebie operator would be, and the banking one won by a landslide

I suppose it could be done with scripting, or with the Box#3 demo version, but I wanted to ask whether there was a readymade solution before trying to make a new one

No, there is no ready-made solution, though you can do it with a script operator, but it is not a trivial matter. It's easier with Box #3 because you can visually read the velocity vector and orientation, do your cross-product to find the proper up-vector then reapply that to the particles.

And yes, it does sound like Oleg will be doing a RotationBank operator in the future.

Oh, it's concerning A particle banking... Well I tried also a Rotation Operator with Speed Space Follow, the result comes to a banking nearer but still not what it should be. Hm, it seams such an easy solvable problem...

What you'll need to do is look at the difference in rotation from time step to time step (or frame to frame) and use that as a multiplier of sorts, so that the more the particle steers in a direction, the more it banks. The math isn't too difficult, but if I recall there are some tricky conversions that will be a pain.

I suppose this shoud be done per integration step. The z axis rotation (speed space follow) rotation should be linked to the y axis. If I can use the speed space follow, then there will be no concerns with an up vector. Can this be done? If yes, then there will be no conversions - it's all in degrees.

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